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我正在使用Itextpdf API生成PDF。PDF已成功生成，但是当我尝试打开它时，它的原因错误“这个文件已经打开，此文件已经打开或由另一个应用程序使用“我不能识别这个代码有什么问题。 这里是我的代码....使用java servlet中的itextpdf生成的pdf
try {
PrintWriter out = response.getWriter();
out.println("Testing1");
Document document = new Document(PageSize.A4, 50, 50, 50, 50);
// Listing 2. Creation of PdfWriter object
PdfWriter writer = PdfWriter.getInstance(document,new FileOutputStream("E:\\Generated.pdf"));
document.open();
// Listing 3. Creation of paragraph object
Anchor anchorTarget = new Anchor("First page of the document.");
anchorTarget.setName("BackToTop");
Paragraph paragraph1 = new Paragraph();
paragraph1.setSpacingBefore(50);
paragraph1.add(anchorTarget);
document.add(paragraph1);
document.add(new Paragraph("Some more text on the first page with different color and font type.",FontFactory.getFont(FontFactory.COURIER, 14, Font.BOLD,new CMYKColor(0, 255, 0, 0))));
document.add(new Paragraph("u r answers are \n a \n b \n c \n d"));
// Listing 4. Creation of chapter object
Paragraph title1 = new Paragraph("Chapter 1", FontFactory.getFont(
FontFactory.HELVETICA, 18, Font.BOLDITALIC, new CMYKColor(0,
255, 255, 17)));
Chapter chapter1 = new Chapter(title1, 1);
chapter1.setNumberDepth(0);
// Listing 5. Creation of section object
Paragraph title11 = new Paragraph("This is Section 1 in Chapter 1",
FontFactory.getFont(FontFactory.HELVETICA, 16, Font.BOLD,
new CMYKColor(0, 255, 255, 17)));
Section section1 = chapter1.addSection(title11);
Paragraph someSectionText = new Paragraph(
"This text comes as part of section 1 of chapter 1.");
section1.add(someSectionText);
someSectionText = new Paragraph("Following is a 3 X 2 table.");
section1.add(someSectionText);
// Listing 6. Creation of table object
PdfPTable t = new PdfPTable(2);
t.setSpacingBefore(25);
t.setSpacingAfter(25);
PdfPCell c1 = new PdfPCell(new Paragraph("First Name",FontFactory.getFont(FontFactory.COURIER, 14, Font.BOLD,new CMYKColor(0, 255, 0, 0))));
t.addCell(c1);
PdfPCell c2 = new PdfPCell(new Paragraph("Last Name",FontFactory.getFont(FontFactory.COURIER, 14, Font.BOLD,new CMYKColor(0, 255, 0, 0))));
t.addCell(c2);
PdfPCell c3 = new PdfPCell(new Paragraph("Enrolment No.",FontFactory.getFont(FontFactory.COURIER, 14, Font.BOLD,new CMYKColor(0, 255, 0, 0))));
t.addCell(c3);
PdfPCell c4 = new PdfPCell(new Paragraph("Password",FontFactory.getFont(FontFactory.COURIER, 14, Font.BOLD,new CMYKColor(0, 255, 0, 0))));
t.addCell(c4);
try
{
Class.forName("com.mysql.jdbc.Driver");
Connection con =DriverManager.getConnection("jdbc:mysql://localhost:3306/erp","admin","123456");
Statement st =con.createStatement();
ResultSet rs = st.executeQuery("SELECT firstname,lastname,asn,password from reg1 where branchname='IT' and sem='3'");
while(rs.next())
{
t.addCell(rs.getString(1));
t.addCell(rs.getString(2));
t.addCell(rs.getString(3));
t.addCell(rs.getString(4));
}
}
catch (Exception e)
{
System.out.print("Parth: " +e);
}
//section1.add(t);
document.add(t);
// Listing 7. Creation of list object
List l = new List(true, false, 10);
l.add(new ListItem("First item of list"));
l.add(new ListItem("Second item of list"));
section1.add(l);
// Listing 8. Adding image to the main document
Image image2 = Image.getInstance("ERPLogo.png");
image2.scaleAbsolute(120f, 120f);
section1.add(image2);
// Listing 9. Adding Anchor to the main document.
Paragraph title2 = new Paragraph("Using Anchor", FontFactory.getFont(
FontFactory.HELVETICA, 16, Font.BOLD, new CMYKColor(0, 255, 0,
0)));
section1.add(title2);
title2.setSpacingBefore(5000);
Anchor anchor2 = new Anchor("Back To Top");
anchor2.setReference("#BackToTop");
section1.add(anchor2);
// Listing 10. Addition of a chapter to the main document
document.add(chapter1);
document.close();
} catch (DocumentException ex) {
Logger.getLogger(enopdf.class.getName()).log(Level.SEVERE, null, ex);
}